The operating system is being launched to current Windows 7 and Windows 8 users in phases, so the number of devices now running Windows 10 will rise steadily in the coming days as more users get access to the platform.

Microsoft clarifies its statement about Windows 10 by noting that you can upgrade from a non-genuine version of Windows 7 or 8.1, but that doesn't mean you now have a legitimate version, according to Ars Technica.